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Driver core: use mutex instead of semaphore in DMA pool handler 

the DMA pool handler uses a semaphore as mutex. use the mutex API
instead of the (binary) semaphore

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Matthias Kaehlcke 2007-04-24 22:45:25 +02:00 committed by Greg Kroah-Hartman
parent 4f6e1945fe
commit b2366d68d9
1 changed files with 7 additions and 7 deletions
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14
drivers/base/dmapool.c
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@ -37,7 +37,7 @@ struct dma_page { /* cacheable header for 'allocation' bytes */
#define POOL_TIMEOUT_JIFFIES ((100 /* msec */ * HZ) / 1000) #define POOL_TIMEOUT_JIFFIES ((100 /* msec */ * HZ) / 1000)
static DECLARE_MUTEX (pools_lock); static DEFINE_MUTEX (pools_lock);
static ssize_t static ssize_t
show_pools (struct device *dev, struct device_attribute *attr, char *buf) show_pools (struct device *dev, struct device_attribute *attr, char *buf)
@ -55,7 +55,7 @@ show_pools (struct device *dev, struct device_attribute *attr, char *buf)
size -= temp; size -= temp;
next += temp; next += temp;
down (&pools_lock); mutex_lock(&pools_lock);
list_for_each_entry(pool, &dev->dma_pools, pools) { list_for_each_entry(pool, &dev->dma_pools, pools) {
unsigned pages = 0; unsigned pages = 0;
unsigned blocks = 0; unsigned blocks = 0;
@ -73,7 +73,7 @@ show_pools (struct device *dev, struct device_attribute *attr, char *buf)
size -= temp; size -= temp;
next += temp; next += temp;
} }
up (&pools_lock); mutex_unlock(&pools_lock);
return PAGE_SIZE - size; return PAGE_SIZE - size;
} }
@ -143,7 +143,7 @@ dma_pool_create (const char *name, struct device *dev,
if (dev) { if (dev) {
int ret; int ret;
down (&pools_lock); mutex_lock(&pools_lock);
if (list_empty (&dev->dma_pools)) if (list_empty (&dev->dma_pools))
ret = device_create_file (dev, &dev_attr_pools); ret = device_create_file (dev, &dev_attr_pools);
else else
@ -155,7 +155,7 @@ dma_pool_create (const char *name, struct device *dev,
kfree(retval); kfree(retval);
retval = NULL; retval = NULL;
} }
up (&pools_lock); mutex_unlock(&pools_lock);
} else } else
INIT_LIST_HEAD (&retval->pools); INIT_LIST_HEAD (&retval->pools);
@ -231,11 +231,11 @@ pool_free_page (struct dma_pool *pool, struct dma_page *page)
void void
dma_pool_destroy (struct dma_pool *pool) dma_pool_destroy (struct dma_pool *pool)
{ {
down (&pools_lock); mutex_lock(&pools_lock);
list_del (&pool->pools); list_del (&pool->pools);
if (pool->dev && list_empty (&pool->dev->dma_pools)) if (pool->dev && list_empty (&pool->dev->dma_pools))
device_remove_file (pool->dev, &dev_attr_pools); device_remove_file (pool->dev, &dev_attr_pools);
up (&pools_lock); mutex_unlock(&pools_lock);
while (!list_empty (&pool->page_list)) { while (!list_empty (&pool->page_list)) {
struct dma_page *page; struct dma_page *page;